/Engine/Source/Runtime/StaticMeshDescription/Public/StaticMeshOperations.h
Note: The material count MUST be the same for both the source and the destination. It will not reorder anything if the count is different.
static void ReorderMeshDescriptionPolygonGroups ( const [FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) & SourceMeshDescription, [FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) & DestinationMeshDescription, [TOptional](API\Runtime\Core\IO\TOptional)< const [FString](API\Runtime\Core\Containers\FString) > UnmatchMaterialNameWarning, [TOptional](API\Runtime\Core\IO\TOptional)< const [FString](API\Runtime\Core\Containers\FString) > DestinationPolygonGroupCountDifferFromSource_Msg )